Which of the following is correct regarding the total internal reflection at the interface between two different optical media ?
(A)The phenomenon of total internal reflection can occur only if light is passing at any angle from a medium of low refractive index to a medium of high refractive index.
(B)The phenomenon of total internal reflection can occur only if light is passing from a medium of high refractive index to a medium of low refractive index and at an angle greater than the critical angle.Correct
(C)The phenomenon of total internal reflection can occur only if light is passing at any angle from a medium of high refractive index to a medium of low refractive index.
(D)The phenomenon of total internal reflection can occur only if light is passing from a medium of low refractive index to a medium of high refractive index and at an angle greater than the critical angle.
Answer: (B)
Solution
Total internal reflection needs two conditions: the light must travel from an optically denser medium (higher refractive
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